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Wall Street Journal

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Talk about dirty money: Scientists are discovering a surprising number of microbes living on cash.

In the first comprehensive study of the DNA on dollar bills, researchers at New York University's Dirty Money Project found that currency is a medium of exchange for hundreds of different kinds of bacteria as bank notes pass from hand to hand.

By analyzing genetic material on $1 bills, the NYU researchers identified 3,000 types of bacteria in  all — many times more than in previous studies that examined samples under a microscope. Even so, they    could identify only about 20% of the non-human DNA they found because so many microorganisms    haven't yet been cataloged in genetic data banks


http://www.wsj.com/articles/SB10001424052702303456104579489510784385696